CVE-2018-9275

In checkusertoken in util.c in the Yubico PAM module (aka pam_yubico) 2.18 through 2.25, successful logins can leak file descriptors to the auth mapping file, which can lead to information disclosure (serial number of a device) and/or DoS (reaching the maximum number of file descriptors).

References

Affected packages

Git / github.com/Yubico/yubico-pam

Affected ranges

Type

GIT

Repo

https://github.com/Yubico/yubico-pam

Events

Introduced

f5363a207b14d46b86022e598399a31201164594

Last affected

432d7c60a1f64bfd1ad05683392cec36c6bc8455

Database specific

{
    "versions": [
        {
            "introduced": "2.18"
        },
        {
            "last_affected": "2.25"
        }
    ]
}

Type: GIT
Repo: https://github.com/yubico/yubico-pam
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

0f6ceabab0a8849b47f67d727aa526c2656089ba

Affected versions

2.*

2.10

2.11

2.12

2.13

2.14

2.15

2.16

2.17

2.18

2.19

2.20

2.21

2.22

2.23

2.24

2.25

2.5

2.6

2.6pre2

2.6pre3

2.7

2.8

2.9

v2.*

v2.6

Database specific

vanir_signatures

[
    {
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2018-9275-73e96989",
        "digest": {
            "line_hashes": [
                "226607563752128757887514930765907415801",
                "279701570390930019583909742435872770862",
                "308494850977619412175153327874514612777",
                "203417458892300943278019038761638732730"
            ],
            "threshold": 0.9
        },
        "source": "https://github.com/yubico/yubico-pam/commit/0f6ceabab0a8849b47f67d727aa526c2656089ba",
        "signature_type": "Line",
        "target": {
            "file": "util.c"
        }
    },
    {
        "deprecated": false,
        "signature_version": "v1",
        "id": "CVE-2018-9275-fa157aba",
        "digest": {
            "length": 1698.0,
            "function_hash": "119299559369141334615512022658670539382"
        },
        "source": "https://github.com/yubico/yubico-pam/commit/0f6ceabab0a8849b47f67d727aa526c2656089ba",
        "signature_type": "Function",
        "target": {
            "file": "util.c",
            "function": "check_user_token"
        }
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-9275.json"

vanir_signatures_modified

"2026-04-11T14:11:15Z"